PDF Encrypt & Decrypt
This PDF is already encrypted. Switch to decrypt mode to remove the password. This PDF is not encrypted. Switch to encrypt mode to add a password.
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Free online PDF encrypt & decrypt tool. Password-protect your PDF files with AES-256 (PDF 2.0) or RC4 128-bit encryption. Control 8 granular permissions — printing, copying, modifying, and more. All processing is done locally in your browser — your files and passwords never leave your device.
Tips & Tricks
Strong Passwords
Use a strong password with at least 8 characters including letters, numbers, and special characters to protect your PDF files effectively.
Remember Your Password
There is no way to recover a lost PDF password. Make sure to store your password in a safe place or use a password manager.
Privacy First
All processing happens locally in your browser. Your PDF files and passwords never leave your device.
Common Use Cases
Protect Documents
Add password protection to sensitive documents
Share Securely
Encrypt PDFs before sharing via email or cloud
Remove Old Passwords
Decrypt PDFs when you no longer need protection
Archive Safely
Encrypt archived financial or legal documents
Client Delivery
Password-protect client deliverables for security
Personal Records
Protect scanned personal documents and IDs
FAQ
Is my PDF data safe?
Yes. All processing is done entirely in your browser. Your PDF files and passwords never leave your device — no data is uploaded to any server.
What type of encryption is used?
We use AES-256 encryption (PDF 2.0 standard) by default, with an option to use RC4 128-bit for compatibility with older PDF readers. You can choose the algorithm in the tool settings. Encrypted PDFs can be opened in any PDF reader by entering the password.
Can I recover a lost password?
No. PDF passwords cannot be recovered. If you lose the password, the PDF cannot be opened. Always store passwords in a safe place.
What is the difference between user and owner password?
This tool sets both passwords to the same value. The user password controls opening the document, while the owner password restricts printing and editing permissions.
Does it work offline?
Once the page has been loaded, the PDF processing library is cached by your browser. You can encrypt and decrypt PDFs offline.